One that a judge or presiding officer raps to signal for order.

Gavel (pronounced gah-vul) ~verb Judge's hammer. Slang used in same way as 'smashed'.

A small hammer that the person in charge of a meeting, court of law, auction etc hits on a table in order to get people’s attentionExamples from the Corpusgavel• Then he banged a gavel to pronounce them married and they all kissed, to wild applause from the gallery.• The big gavel...